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Total phenols (A), ortho-diphenols (B), flavonoids (C), total tannins (D), condensed tannins (E), and hydrolysable tannins (F) in grape cane extracts from Vitis vinifera cultivars “Aglianico, “Fiano” and “Greco”. All determinations were performed in triplicate and results were expressed as mean ± SD. Bars with different letters denote significant differences at p < 0.05. (A: a-f, g-l, m-q; B: a-g, h-m, n-t; C: a-f, g-l, m-r; D: a-f, g-n, o-u; E: a-f, g-l, m-s; F: a-e, f-k, l-q).
